Television – Receiver circuitry – Remote control
Patent
1994-09-15
1995-09-05
Groody, James J.
Television
Receiver circuitry
Remote control
348731, 348 10, H04N 718, H04N 544
Patent
active
054483131
ABSTRACT:
A VCR controls a cable box, and monitors television signals received from the cable box in a "closed loop" manner. By monitoring an appropriate signal the controller of the VCR can detect perturbations of signal level which indicate that the cable box has changed channels. That is, the output signal of the cable box remodulated on, for example, the RF carrier frequency of channel 3, will be momentarily lost during the period in which the cable box changes channels. Thus, the subject apparatus can determine if the cable box is "off" or "on" by issuing a channel change command and observing if the cable box responds to the channel change command. In one embodiment of the invention the VCR causes an on-screen display of an error message if it determines that it is unable to control the came box.
REFERENCES:
patent: 4688082 (1987-08-01), Kato
patent: 5020139 (1991-05-01), Keenan
patent: 5020140 (1991-05-01), Teskey
patent: 5046093 (1991-09-01), Wachob
patent: 5123046 (1992-06-01), Levine
patent: 5151789 (1992-09-01), Young
Programming the 6502 by Rodnay Zaks, p. 145.
Furrey John H.
Kim Sung J.
Emanuel Peter M.
Groody James J.
Lee Michael H.
Lenihan Thomas F.
Thomson Consumer Electronics Inc.
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